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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3163d2567bb5b77e81c002a470a4086ea07f56265de96a06b20d83f73a5597' 
  AND token = '2Nx/grE2TsOTLtLA1PRRKei8easRJ0H4D3qUeeZ82rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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