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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52baa8c3c29abf3d5599361ef717eaa298b144a78fec4e815649d1b8a600a457' 
  AND token = 'o4ZVW2otqA98JzBLn/5Jup2lIzkSAglsRcsm198or5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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