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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47d1ea7e95d0bbe9e4d1b3c7c1ae0a1de3eb592b246a0e77973b39298812d90' 
  AND token = '0u/e+0H8tF1U6iJS9EM+7i7NjiFyd6PJpoy9jk7GaoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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