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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea882efc3170c2a66a03f503a751b4ef8ce4890a0b85852ed9664e519ecc17c' 
  AND token = '7ixAOVQWH+wX5ADeuIsYcUfhCCiKzHJiZXyEZolq0xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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