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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9d60c18ceb3e20aff5db69f0a5d764cd0d947492a92275064b1d529a0cd05c' 
  AND token = 'KNdI8oO6zgrX1DCELwZuNNLkBYQCEHGe7v5iDaaSqbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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