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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843ab6b5b400eda93aa097e2c15445e91c0a70d864ea050ef9057c95268dfaad' 
  AND token = '5HE0uMXNbukqcSoRhAGrOy5yCxzHruSDVydicl6EWRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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