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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c18f37ba39b96f7519371b97fae38e542498691eb4615c8f408082881d629d2' 
  AND token = 'tM7UcrMkTkJ5J0lev3GB7i/dyWFpOJK6XOI201qLSNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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