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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432a77a74ace8121a06e1f4eee476262de86b2dc2b05fa7a4f5881d314d4fb1a' 
  AND token = 'pgg5lTWNOznioCIGbKs5vircrw5qGyJHdNl+1pcWr9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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