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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67676d4c9a1fdc955bede7067851d3cf1793cd21c239e0126e8dcb7b33a7d7e8' 
  AND token = 'Xeho9mlJdHYRXsW//n5LA3UO6XJkfZEHTuc2ECGbysw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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