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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb57b152254259e1def6f2b0909e7fd1ef25fc3b6122f9b1c260e8ad8362ad3' 
  AND token = 'V07tKRCgGcbBDft+DGjj2t7ocBrg3K7MhdUQsLs749A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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