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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93ffab8f9c1faccf5c02bd3102e7fb7c19b1eff87780a85cdb21a8533408317' 
  AND token = 'JS6j54CdsT70m4N3Z9vrG7my12dER5DNt0/F5nOftoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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