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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ee49fe3fe9def4541372799b7d57e43647a0ef240a6a696cb0593f205f6516' 
  AND token = '9i/1+6p+r0/N/dnFMOfy5wHCIgltbUPalLU+NHHK4MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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