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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c2beb991fd050c75a89e93aa7fc41b6c2f5612cd983fd9b2b47a18d39b529d' 
  AND token = '+xaGArvrwzi0g0KTY9tLapF8fN935h4wL0NvTv03vPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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