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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb78862bb7f32e09b9b6660c1bf58e98bd8976b5462b200c5ccf36cae8f1973b' 
  AND token = 'c/IlmPeuS15nEWdvijkMyeJ3Gj4WlLMNShhrrcUEo/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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