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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee288e26d76858eb969b64e54f77a0738e96a0a1c220aa357c04f106c025d25' 
  AND token = 'nrwjMxU8o7/BVx5bioKm0xr7ydd3loKN6lQYJHVCA9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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