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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b768723567bf1797ff3b400792fde6aa0f1e2c2cc397cf7dc095605c0d877de' 
  AND token = 'tPT2XXhqA391sRQ4NCvANrfb9EgcWMdXYRSH4mXLMSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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