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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd652c488fa7b5a43fb49c5680da4b2a3e9c7ec17e97593d313ec1c2363f02d' 
  AND token = 'v5iwNNO+3StC4U5pJA1reA8i2/v4IHAV7Ffx2SlOXNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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