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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daca5576566f0edbb332d4948819d55d1969bb89c264f30fe78f245b1309db0' 
  AND token = 'hIP/l85aOpeZ9aK/FRMeeZ6f2itBRlrrmlrBI20ZAg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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