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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd418ae741b63b9af92083f7af74dc001a5782b135bf0cb942c8b9d89944a137' 
  AND token = 'ZFQr1DqbUQfN6ni0m0/IVvG0oO9IJwo6RvS2VZqosB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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