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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc840a5660c10b931970d91cecc7f3e231f2be181af0074410981984a1134c6' 
  AND token = '+y4Hz0WM7j4rX4gh0wmabHg+S74c/EoVAOZMwAKkroQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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