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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e1a4b3b6785a44cfa3b2ab0e1bed2c6d4d57d256f5ef6696ec5b51b2d22d1e' 
  AND token = 'GjC3rHoJ9puinTcN+uqPYVIl67huqdtAkp4lyo1kWEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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