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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90196fa8d92dcbd7e63e652d5abadd018da521d1f00a958e32b4647b033aeefe' 
  AND token = '3LeGwe1LIRJ8N2zqXzMGRugxEYrijWUhdWY478Z11bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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