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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e6cc72bf2b27638e8f59219165e382b185dd8ccea8ce2023fc32c1f78799bc' 
  AND token = 'rPrH5msNhSIZHp1VEho7Khxj2tSMmjHk/6xNuDKOrko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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