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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab02c4d4e4e5f3cffb9ee94c6c51a01d02c447a9885f604762874399fbe8f6b' 
  AND token = 'iqlseTNKqSu/5cLYj7atBqnj1mXNgjIY4NW3ajivDwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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