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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19c978dd53db200f5f974efd245fc4561f07b56ea91a51e0835ef055be58716' 
  AND token = '5+da/rYCx2kEZg1/H0Mchg19/xmZ0aslxMcM5bVUS04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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