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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5d7ab81ee4bb021dac37566160d4c77299035c51905635d99fd870e0724b89' 
  AND token = 'g/VlcNWts4dVmC9dkjxFUndOtPqc/8UDv9BuH/ZhlEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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