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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2a3fb2b3b80a324483cb4e707e8898fa5eb285bd4939912296a2242e1fb3b7' 
  AND token = 'VnwsfxaGm8JVePw6IjIHt0uxNpIObvVEDD8DHO08HU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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