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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c91106737a8c7ff2236bdd020cb4464eb61f795aa05a353d573457d14e6e28' 
  AND token = 'ezngO9VuU9CTx1t0rHgtNzf4mfD3xOezkjOuaLIAoe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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