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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37e1f7f761f855d6cb8c47d0de0052a71bd9b2f28d6b583b30a83c46863a7e9' 
  AND token = 'cPcpkwrYtKogurnoAsKQumizi57n9zEr2ZKXv0oXUzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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