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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8dea320844ac69f5e82f3fe39718bc0983d6a13c1d2786ce55b875f293268d' 
  AND token = 'mg5nKtig+/Vcx23RQwrR5ZGO0360POguGbkccwoAeaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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