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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e54861a1baa29bc69a7af82d7d835d13051289b59adcb16aa01cdaf8f11fb41' 
  AND token = 'jY0B9E8pE+1o18A2uxe6kx2JBiTCJf2VBqJytD2Ikqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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