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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeec2ea50bcd15f9fbfd7e9563023bba79ff98766a724e3599524fb061457e3b' 
  AND token = 'PJciWbdXvD3GGz4ubmvaZutVK23DwAcNi4Q3carxG5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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