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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26c40f399832590cc2ebb00369d4afba2a631ea1f07f878fa2feeadde35a9d5' 
  AND token = 'u7dclg9KR90moxB+oF+myTkqpvAoR3GYm7l0euIFrR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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