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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771e46e632f1fe88b8093d2babbf9b770fe0eb23920e5db350bd4f81e68bb203' 
  AND token = 'W5sBi4lOq54t0I622/1llSfpgsA1bdOvkqk/aJB5gtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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