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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6250efb2e4ba5ceb06343a54389b7613d22283d0a17dd5585f383b488cc25af' 
  AND token = 'ACIH8AzAdV1ywyDrBclG/FLCpKEtbDL9YMiHLk6LAcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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