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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19ad46fc476f4673c7175b6ab9ca80f15c21b4cabb874b2cc54b52c3841a24c' 
  AND token = 'Z32VWHttbrwr8xWJPjQsO6+8kn0uYrVTIvXdX+4HtDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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