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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0357829df5329a0127389e8fd75e8119057e47c0db8abbe489a3121eeb9fb5' 
  AND token = '05tAHsJOqnIWtu5FrvEypreUL+6mTwvK4jsII3RtVnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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