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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a2c65582d671b1c9cc967db7050d5f6a52c5496357f50ab2164652d6e5be82' 
  AND token = '7Fi7fh3eAbnq9sfJpMbOpPNN0+FwsERVGnN8WuufG4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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