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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2905eff2d4b1b242865032aac44cd42a630d1e2f7eebbb117ef8e738ab60e7' 
  AND token = '+CEDCoFIdigFEVIlHAh5eyfRaBhx/FTCDBixi2NcrnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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