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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304864df8277490fa06b2a582684a8c62b20f1f1195e3fb289ef7dc0f54961db' 
  AND token = 'Ntk7V2xAkeSwn/wMuPjFFyydXqmzR4ELzHezcHTWKoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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