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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab05c139bf7fb19b7de1c936ba90687d1c6fc46a213bdf1d2b3f6db1e1f4b630' 
  AND token = '5D0K4G4LirH3p5Nq/StQ6Sjp2pRAwPvk6bMPZ3qHxQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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