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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d6ed14ba57b06a4fedea7df4455e6ee489b87410fd2e6cd3f35cfdbe97a985' 
  AND token = '1P1801xsZnM/OA/Q2WYt/vVlOqSH+ptxkYZkF82b6NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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