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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d0d18ef60a26edb15b0b235906b498e69bfed01452403bca49f2a4858ba13a' 
  AND token = '4VhOdTd4bFgMoRyPcZQczq6E40Jrjp4Fo/QdryRV3YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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