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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6618f63125b1313c4ac55da7809311438cdb26b25ae204c93e1eb112ada33ea4' 
  AND token = 'i+LW0PjslKIjkPESGzVD3lgpYLKkK+qS9T//UEVIdwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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