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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0879de04852f2e02f35cb32a817da44dd342281c0672cb8c4dc8506e4a1fe57' 
  AND token = 'xC5HamDSkI49+qpvDzxYR9uubSKn1j/mv07lDvSLOR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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