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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce17cde826b93bd0e1eac6d568aa0ce0842906498b637b4faa9f90cdfce0767' 
  AND token = 'Zqq1kS6B+nYGK0HNg9P3O2Wtj79RXfh3Q+EqtH1rIbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}