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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc40cb10816f67459e966baa468f6485ca2aab4aab7f29f2d6e7b8048c2f1ca4' 
  AND token = 'L2BCQ1qZyYtTZzaunmjaLh9+P2JJ6UXhtWTIavJazgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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