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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5d27df4f47237df332b4ae93cd79660d9a8726d07a424fb13b0fbb83300427' 
  AND token = 'lYZt1IoaH9U1NIRJxAM4SU4DnSBuVomGoiIwniXhR5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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