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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee885c4fe1886c8a1d48bb344382d0207c06187da76f8760c40961c1c9d7cb6' 
  AND token = 'MF7bvInB4qee9uyMekTyuZk/zCY8vkUzBpTzoEPlUzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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