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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cc15dc0d5f24e65a6c2bccc23bb7e15c10bfbc1e43610c2a1db26d030def2a' 
  AND token = '4AFVm6lDSeANxh23cYdtCpRj52Yg77UpTUc2Ms8b+Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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