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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b1942569d53a22f3e7c13bbbfe4db2a1a36d9e83c43f182c2663aab6b5a81f' 
  AND token = 'r/eYkFq1atJS8+4jJkDjX4VTQFFjN9mznvBQtuS1QAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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