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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7ca547a4371d60377f0cf5309e4209d87d0e72f830e1db1479fc0541b7d162' 
  AND token = 'GUtFKlYJjwyte7dSDVDGfWyb3U/LO/3oV7NfMMDMJeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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