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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5877010a1bc4401097f4470298dbec377fc85c1a2682cf524158d23d028fcf' 
  AND token = 'LlR5etP4WriUtsosT+aG6RbaYd2Nf+cuDsJ05oiApTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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